CBSE Class 12 Biology Strategies for Enhancement in Food Production Assignment Set B
Point to Remwmber Apiculture : Rearing of honeybees for the production of honey, beewax, royal jelly and bee Venom. Artificial insemination : Introduction of semen of good quality of male into the vagina of female. Explant : A part of plant excised from its original location…
CBSE Class 12 Biology Reproductive Health Assignment Set B
POINTS TO REMEMBER Amniocentesis : Diagnostic technique to detect genetic disorder in the foetus. Infertility : Inability to produce children in spite of unprotected sexual cohabitation of a couple. Mortality : Death rate (number of persons removed from a…
CBSE Class 12 Biology Reproduction In Organisms Assignment Set B
POINTS TO REMEMBER Bulbils : These are small, fleshy buds which develop into new plants as in Agave. Clone : A group of organism derived from a single individual and hence morphologically and genetically similar. Embryogenesis : The process of development of embryo from zygote…
CBSE Class 12 Biology Principles of Inheritance and Variation Assignment Set B
POINTS TO REMEMBER Allele : Various or slightly different forms of a gene, having same position on chromosomes. Phenotype : The observable or external characteristics of an organism Genotype : The genetic constitution of an organism. Monohybrid cross : …
CBSE Class 12 Biology Organisms and Populations Assignment Set B
POINTS TO REMEMBER Adaptation : Any attributes of the organism (morphological, physiological, behavioural) that enables the organism to survive and reproduce in its habitat. Aestivation : Strategy to escape in time during summers (summer sleep). E.g., …
CBSE Class 12 Biology Molecular Basis of Inheritance Assignment Set B
POINTS TO REMEMBER Anticodon : A sequence of three nitrogenous bases on tRNA which is complementary to the codon on mRNA. Transformation : The phenomenon by which the DNA isolated from one type of a cell, when introduced into another type, is able…
CBSE Class 12 Biology Microbes in Human Welfare Assignment Set B
Important Questions for NCERT Class 12 Biology Microbes in Human Welfare Ques. Conversion of milk to curd improves its nutritional value by increasing the amount of (a) vitamin D (b) vitamin A (c) vitamin B12 (d) vitamin E. Answer: C Ques. Dough kept overnight in warm…
CBSE Class 12 Biology Human Reproduction Assignment Set B
POINTS TO REMEMBER Acrosome : A small, sheathy structure at the end of a sperm. Blastula : A stage of embryogendesis which comes after morula and has a hollow fluid filled space called blastocoel. Endometrium : Innermost glandular layer lining the uterine…
CBSE Class 12 Biology Human Health and Disease Assignment Set B
POINTS TO REMEMBER Carcinogens : Cancer causing agents. e.g., gamma rays. UV rays, dyes and lead. Immunity : Resistance to infection or antigen. Immuno Suppressant : The chemical which supress the immunity response to antigen partially or completely…
CBSE Class 12 Biology Evolution Assignment Set B
POINTS TO REMEMBER Artificial Selection : It is the process carried out by man to select better breeds of plants and aminals. Bio-geography : The study of patterns of distribution of plants and aminals in different parts of earth. Founders Effect : A…
CBSE Class 12 Biology Environmental Issues Assignment Set B
POINTS TO REMEMBER Pollution : Undesirable physical/chemical/biological characteristics of air/water/ land which cause damage to the animals/plants/humans and architectural structures. Pollutants : Agents which cause pollution. Slash and…
CBSE Class 12 Biology Ecosystem Assignment Set B
POINTS TO REMEMBER Startification : Vertical distribution of different species occupying different levels in an ecosystem. Primary Production : Amount of biomas or organic matter produced per unit area over a time period by plants during photosynthesis.…
CBSE Class 12 Biology Biotechnology Principles and Processes Assignment Set B
POINT TO REMEMBER Bacteriophage : A virus that infects bacteria. Bioreactor : A large vessel in which raw materials are biologically converted into specific products under optimal conditions such as temperature, pH, substrate, salts, vitamins, oxygen. Stirring type…
CBSE Class 12 Biology Biotechnology and its Applications Assignment Set B
POINTS TO REMEMBER Biopesticides : Biological agents that are used to control weeds, insects and other pests. Cry Gene : The Bt toxins are coded by a gene named Cry. Cry Protein : The insecticidal protein which is produced by Bacillus thuringiensis…
CBSE Class 12 Biology Biodiversity and Conservation Assignment Set B
POINTS TO REMEMBER Biodiversity : Term used to describe diversity at all levels of biological organisation. Term coined by socio-biologist Edward Wilson and was also used by Walter G Rosen for the diversity of life forms. Biodiversity refers to totality of genes…